calculated under the condition that \({\hat{x}},\;{\hat{y}},\;{\hat{z}}\)  are the
directions of the principal crystal axes of the cubic lattice.[1]}, [2]}
Nominal times \(\tau _D\simeq 0.8\,\) ps and \(\tau _P\simeq 35\,\) ps characterize respectively deformation and polarization electron–acoustic-phonon
scattering in the three-dimensional GaAs crystal for longitudinal sound velocity \(c_s\!=\!5.14\cdot 10^5\,\) sm/c
(see Ref. di96 and cf. Ref. gale87).
